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<< Click to Display Table of Contents >> Setting up Haul Roads and Accesses |
  
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<< Click to Display Table of Contents >> Setting up Haul Roads and Accesses |
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A haul route is a three-dimensional path along which trucks travel during simulation. For each increment of the simulation (excavation and dump) a haul route is required which connects the excavation point and the dump point. Haul routes are constructed in 3d-DigPlus is an assemblage of Roads. A complete haul route consists of the following Road elements:
Main Haul Road. Main Haul Roads are the permanent or semi permanent roads along which trucks travel having exited the strip and en route to the dump. Main Haul Roads can exist on the topography adjacent to pit area, on the pit floor, on cross pit bridges, end walls etc. Main Haul Roads usually model actual roads and as such are generally modelled in 3d-DigPlus to follow the full extents of the road in the pit. Typically trucks use only portion of the main haul routes, entering at a point near the excavation site and departing near the dump. Similarly main haul routes in 3d-DigPlus use only that portion of the designed road that is required for a particular truck cycle. A 3d-DigPlus file can have any number of Main Haul Routes, each with a unique name.
Excavation Access roads. The Excavation Access roads (or Excavation Accesses) model the ramp from the Main Haul Route down to the level of the current excavation lift. Excavation Accesses are dynamic, as the excavation progresses down in lifts and the ramp length increases so the Excavation Access length increases to model the required ramp length for a particular lift.
Excavation Manifold. The Excavation Manifold is automatically generated road that connects current toe (base) of the Excavation Access to the current point of excavation.
Dump Access roads. The Dump Access roads (or Dump Accesses) model the ramp from the Main All Route up to the level of the current dump lift. Dump Accesses are dynamic, as the dump progresses up in lifts and the ramp linked required increases, so the Dump Access length increases to model the required ramp length for a particular dump lift.
Dump Manifold. The Dump Manifold is an automatically generate road that connects the current crest (top) of the Dump Access to the current dump point on the tip face.
The figure below illustrated this concepts:
As well as the above road categories there are two distinct modes of modelling a road:
Road on Terrain. This is the most accurate way of modelling a road. With this mode of road modelling the user creates the full three-dimensional model of the road. This is done by placing a horizontal alignment for the road in a Terrain Window, and creating a vertical alignment in a Cross Section Window. Main Haul Roads, Excavation Access Roads and Dump Access Roads are all modelled as roads on terrain. Note that 3d-DigPlus does not distinguish between these road types when they are created, this distinction is added when roads are assigned to Subsequences. However when creating these roads there are different requirements for each type and these are discussed in the following topics.
Virtual Road. The Virtual Road mode uses the known end points of the road plus user defined parameters to generate a theoretical three-dimensional path. Virtual Roads can be used for entire haul route or any component of a haul route. Note that Excavation and Dump Manifolds are always modelled as Virtual Roads due to their highly dynamic nature.
The procedure for creating and designing a road is divided into two components:
•Geometric design. The geometric design consists of creating both Horizontal and Vertical Alignments. Together these alignments describe the full three-dimensional geometry of the Road.
•Applying Truck Parameters to Road. Truck Parameters consists of speed limits and friction coefficients.
These two design components are covered separately in the following topics.